Filtering device and water purification system

Abstract

The utility model discloses a filter device and water purification system, it belongs to water purification technical field, and the filter device includes filter bottle and filter core subassembly, and the filter bottle includes bottle body and bottle cap, and the bottle body has the accommodation cavity, is provided with raw water inlet and pure water outlet that communicate with the accommodation cavity on the bottle body, and the bottle cap is detachably connected with the bottle body to open or close the accommodation cavity, the filter core subassembly sets up in the accommodation cavity, and the filter core subassembly includes prefilter core, reverse osmosis filter core and postfilter core, and the reverse osmosis filter core sets up between prefilter core and bottle cap, and the raw water inlet communicates with the water inlet side of prefilter core, and the postfilter core sets up in the inside of reverse osmosis filter core, and the pure water outlet communicates with the water outlet side of postfilter core. The water purification system includes water inlet component, water outlet component and above-mentioned filter device, and the water inlet component communicates with raw water inlet, and the water outlet component communicates with pure water outlet. The bottle cap is detachably connected with the bottle body to open or close the accommodation cavity, and is convenient to install and dismount, and reduces the cost of replacing the core.

Description

Technical Field

[0001] This utility model relates to the field of water purification technology, and in particular to a filtration device and a water purification system. Background Technology

[0002] In existing water purification equipment, water purification requires multiple steps and often requires 3 or 4 stages of filter cartridges. External pipes are needed to connect the inlet and outlet of different filter cartridges, making the water purification equipment's piping complex and taking up a lot of space.

[0003] Existing composite filter cartridges typically integrate multiple filter cartridge components into a single filter bottle, significantly reducing space usage. However, the bottle caps are mostly screw-on, making them non-removable from the bottle body. Since different filter cartridges have different lifespans, service personnel need to make multiple visits to replace them, resulting in high maintenance costs. Utility Model Content

[0004] This invention provides a filtration device and a water purification system to solve the technical problem of inconvenient maintenance of composite filter elements in the prior art.

[0005] Based on the above concept, the technical solution adopted by this utility model is as follows:

[0006] A filtration device, comprising:

[0007] A filter bottle includes a bottle body and a bottle cap. The bottle body has a receiving cavity, and the bottle body is provided with a raw water inlet and a pure water outlet communicating with the receiving cavity. The bottle cap is detachably connected to the bottle body to open or close the receiving cavity.

[0008] A filter assembly is disposed in the receiving cavity. The filter assembly includes a pre-filter, a reverse osmosis filter, and a post-filter. The reverse osmosis filter is disposed between the pre-filter and the bottle cap. The raw water inlet is connected to the inlet side of the pre-filter. The post-filter is disposed inside the reverse osmosis filter. The pure water outlet is connected to the outlet side of the post-filter.

[0009] Preferably, the filtration device further includes a central water outlet pipe, which passes through the pre-filter element. One end of the central water outlet pipe is connected to the water outlet side of the post-filter element, and the other end of the central water outlet pipe is connected to the pure water outlet.

[0010] Preferably, the bottle body is also provided with a wastewater outlet, the end of the reverse osmosis filter element away from the bottle cap is inserted into the pre-filter element and a wastewater area is formed between the two, a wastewater channel is formed between the water outlet center pipe and the pre-filter element, and the wastewater side of the reverse osmosis filter element, the wastewater area, the wastewater channel and the wastewater outlet are connected in sequence.

[0011] Preferably, the post-filter cartridge includes a post-filter material and a post-central tube, the post-filter material is sleeved on the outside of the post-central tube, and the end of the outlet central tube is inserted into the post-central tube.

[0012] Preferably, the pre-filter includes a pre-shell, a pre-filter media, and a pre-center tube. The pre-filter media is disposed inside the pre-shell, the pre-center tube passes through the pre-filter media, and the outlet center tube passes through the pre-center tube.

[0013] Preferably, the bottle body is also provided with a pre-outlet and a membrane inlet communicating with the accommodating cavity. The pre-outlet is connected to the outlet side of the pre-filter element, the membrane inlet is connected to the inlet side of the reverse osmosis filter element, and the pre-outlet is connected to the membrane inlet.

[0014] Preferably, the filtration device further includes a pump assembly disposed outside the filter bottle, the pump assembly having an inlet end connected to the pre-outlet and an outlet end connected to the membrane inlet.

[0015] Preferably, a limiting groove is provided inside the bottle, one end of the pre-filter element is inserted into the limiting groove and a first sealing element is provided between the two; and / or, a positioning groove is provided on the bottle cap, and one end of the reverse osmosis filter element is inserted into the positioning groove.

[0016] Preferably, the bottle cap is threadedly connected to the bottle body.

[0017] A water purification system includes an inlet component, an outlet component, and a filter device as described above. The inlet component is connected to the raw water inlet, and the outlet component is connected to the pure water outlet.

[0018] The beneficial effects of this utility model are as follows: The filtration device proposed in this utility model integrates a pre-filter, a reverse osmosis filter, and a post-filter inside the filter bottle. The water flows sequentially through the raw water inlet, the pre-filter, the reverse osmosis filter, the post-filter, and the pure water outlet, ensuring a compact structure and reducing space occupation. The reverse osmosis filter is located between the pre-filter and the bottle cap, and the post-filter is located inside the reverse osmosis filter, which does not affect the flow rate of the pre-filter and ensures sufficient filtration efficiency. The bottle cap and the bottle body are detachably connected to open or close the receiving cavity, which facilitates installation and disassembly and reduces the cost of filter replacement. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the filtration device provided in this embodiment of the utility model;

[0020] Figure 2This is a first cross-sectional view of the filtration device provided in this embodiment of the utility model;

[0021] Figure 3 This is a second cross-sectional view of the filtering device provided in this embodiment of the present invention;

[0022] Figure 4 This is a partial structural cross-sectional view of the filtration device provided in this embodiment of the utility model;

[0023] Figure 5 This is a cross-sectional view of the filter bottle provided in an embodiment of this utility model;

[0024] Figure 6 This is a cross-sectional view of the filter element assembly provided in an embodiment of this utility model;

[0025] Figure 7 This is a schematic diagram of the structure of the filter element assembly provided in this embodiment of the utility model;

[0026] Figure 8 This is a partial structural schematic diagram of the filter element assembly provided in an embodiment of this utility model.

[0027] In the picture:

[0028] 10. Filter bottle; 11. Bottle body; 111. Receptacle cavity; 112. Raw water inlet; 113. Pure water outlet; 114. Pre-filter outlet; 115. Membrane inlet; 116. Wastewater outlet; 117. Limiting groove; 1171. First limiting groove; 1172. Second limiting groove; 1173. Third limiting groove; 118. Center groove; 12. Bottle cap; 121. Positioning groove; 13. Sealing ring;

[0029] 20. Filter cartridge assembly; 21. Pre-filter cartridge; 211. Pre-filter housing; 212. Pre-filter media; 213. Pre-filter center tube; 214. Pre-filter top cap; 215. Pre-filter bottom cap; 22. Reverse osmosis filter cartridge; 221. Membrane support; 222. Membrane element; 223. Reverse osmosis bottom cap; 23. Post-filter cartridge; 231. Post-filter media; 232. Post-filter center tube;

[0030] 30. Central water outlet pipe;

[0031] 40. First sealing element;

[0032] 101. Wastewater area; 102. Wastewater passage. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0034] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] See Figures 1 to 8 A filtration device includes a filter bottle 10 and a filter element assembly 20. The filter bottle 10 includes a bottle body 11 and a bottle cap 12. The bottle body 11 has a receiving cavity 111. The bottle body 11 is provided with a raw water inlet 112 and a pure water outlet 113 communicating with the receiving cavity 111. The bottle cap 12 is detachably connected to the bottle body 11 to open or close the receiving cavity 111. The filter element assembly 20 is disposed in the receiving cavity 111. The filter element assembly 20 includes a pre-filter 21, a reverse osmosis filter 22 and a post-filter 23. The reverse osmosis filter 22 is disposed between the pre-filter 21 and the bottle cap 12. The raw water inlet 112 is connected to the water inlet side of the pre-filter 21. The post-filter 23 is disposed inside the reverse osmosis filter 22. The pure water outlet 113 is connected to the water outlet side of the post-filter 23.

[0038] By integrating the pre-filter 21, reverse osmosis filter 22, and post-filter 23 into the filter bottle 10, the water flows sequentially through the raw water inlet 112, the pre-filter 21, the reverse osmosis filter 22, the post-filter 23, and the pure water outlet 113, ensuring a compact structure and reducing space occupation. The reverse osmosis filter 22 is located between the pre-filter 21 and the bottle cap 12, and the post-filter 23 is located inside the reverse osmosis filter 22, which does not affect the flow rate of the pre-filter 21 and ensures sufficient filtration efficiency. The bottle cap 12 is detachably connected to the bottle body 11 to open or close the receiving cavity 111, which facilitates installation and disassembly and reduces the cost of filter replacement.

[0039] In related technologies, composite filter cartridges place the pre-filter cartridge 21 inside the reverse osmosis filter cartridge 22, resulting in a smaller diameter for the pre-filter cartridge 21 and significantly reducing its throughput. In this embodiment, the reverse osmosis filter cartridge 22 is positioned between the pre-filter cartridge 21 and the bottle cap 12, maximizing the diameter of the pre-filter cartridge 21 to ensure its throughput.

[0040] For example, one end of the bottle body 11 is provided with an installation port, which communicates with the receiving cavity 111. The filter element assembly 20 is installed and removed from the installation port, and the bottle cap 12 is provided at the installation port. The raw water inlet 112 and the pure water outlet 113 are both provided at the end of the bottle body 11 away from the bottle cap 12, which makes the structure compact and does not occupy the outer peripheral space of the bottle body 11.

[0041] In this embodiment, the bottle cap 12 is threadedly connected to the bottle body 11, facilitating installation and disassembly and ensuring a tight seal. Exemplarily, the bottle cap 12 has an internal thread, and the bottle body 11 has an external thread, which connects to the internal thread. To ensure a tight seal, a sealing ring 13 is provided between the bottle cap 12 and the bottle body 11. The sealing ring 13 can be provided in one layer or two layers. Exemplarily, two sealing rings 13 are provided: one sealing ring 13 is located at the end face of the bottle body 11, and the other sealing ring 13 is located on the outer periphery of the bottle body 11, effectively sealing both the end and the outer periphery of the bottle body 11. In other embodiments, the bottle cap 12 and the bottle body 11 are snap-fitted and / or magnetically connected.

[0042] The bottle body 11 is also provided with a pre-outlet 114 and a membrane inlet 115 that are connected to the receiving cavity 111. The pre-outlet 114 is connected to the outlet side of the pre-filter 21, and the membrane inlet 115 is connected to the inlet side of the reverse osmosis filter 22. The water flows sequentially through the raw water inlet 112, the pre-filter 21, the pre-outlet 114, the membrane inlet 115, the reverse osmosis filter 22, the post-filter 23, and the pure water outlet 113. By setting the pre-outlet 114 and the membrane inlet 115, the water filtered by the pre-filter 21 can flow smoothly to the inlet side of the reverse osmosis filter 22.

[0043] The pre-filter outlet 114 can be directly connected to the membrane inlet 115, or it can be connected via a pump assembly. Exemplarily, the filtration device also includes a pump assembly disposed outside the filter bottle 10. The inlet of the pump assembly is connected to the pre-filter outlet 114, and the outlet of the pump assembly is connected to the membrane inlet 115. During water production, the pump assembly is activated, allowing the water filtered by the pre-filter cartridge 21 to flow rapidly to the reverse osmosis filter cartridge 22, ensuring filtration efficiency.

[0044] The filtration device also includes a central outlet pipe 30, which passes through the pre-filter element 21. One end of the central outlet pipe 30 is connected to the outlet side of the post-filter element 23, and the other end is connected to the pure water outlet 113. Water filtered by the reverse osmosis filter element 22 flows through the post-filter element 23 into the central outlet pipe 30 and flows out from the pure water outlet 113. The central outlet pipe 30 passes through the pre-filter element 21 to facilitate guiding the water from the post-filter element 23 to the pure water outlet 113.

[0045] The bottle body 11 is also provided with a wastewater outlet 116. The end of the reverse osmosis filter element 22 away from the bottle cap 12 is inserted into the pre-filter element 21 and a wastewater area 101 is formed between the two. A wastewater channel 102 is formed between the water outlet central pipe 30 and the pre-filter element 21. The wastewater side of the reverse osmosis filter element 22, the wastewater area 101, the wastewater channel 102 and the wastewater outlet 116 are connected in sequence.

[0046] The pre-filter cartridge 21 includes a pre-filter housing 211, a pre-filter media 212, and a pre-filter central tube 213. The pre-filter media 212 is disposed within the pre-filter housing 211, and the pre-filter central tube 213 passes through the pre-filter media 212. The outlet central tube 30 passes through the pre-filter central tube 213. The pre-filter central tube 213 provides space for the outlet central tube 30, making full use of space, ensuring structural compactness, and facilitating communication between the post-filter cartridge 23 and the pure water outlet 113. A wastewater channel 102 is formed between the outlet central tube 30 and the pre-filter central tube 213, and the interior of the outlet central tube 30 is used for the flow of pure water.

[0047] For example, the pre-filter housing 211 is a detachable housing, facilitating the installation of the pre-filter media 212 and the pre-filter center tube 213. For example, the pre-filter media 212 is an annular cylinder, with the outer ring side of the pre-filter media 212 being the inlet side and the inner ring side being the outlet side; that is, the space between the pre-filter media 212 and the pre-filter center tube 213 is the outlet side. The pre-filter media 212 is mainly used for pre-treating the inlet water, thereby improving the service life of the reverse osmosis filter element 22.

[0048] For example, the pre-filter material 212 is disposed between the upper front cover 214 and the lower front cover 215. Both the upper front cover 214 and the lower front cover 215 are annular covers, and the hollow inner ring region of the pre-filter material 212 connects the hollow inner ring regions of the upper front cover 214 and the lower front cover 215.

[0049] A limiting groove 117 is provided inside the bottle body 11. One end of the pre-filter element 21 is inserted into the limiting groove 117, and a first sealing element 40 is provided between the two. The insertion limits the pre-filter element 21, ensuring that the pre-filter element 21 can be smoothly installed in place, and the first sealing element 40 provides a sealing function. In this embodiment, the end of the pre-filter element 21 closer to the bottle cap 12 is defined as the upper end, and the end of the pre-filter element 21 farther from the bottle cap 12 is defined as the lower end. The lower end of the pre-filter element 21 is inserted into the limiting groove 117.

[0050] For example, the limiting groove 117 is an annular groove and has three sections, which are the first limiting groove 1171, the second limiting groove 1172 and the third limiting groove 1173 from the outside to the inside. The front housing 211 is inserted into the first limiting groove 1171, the raw water inlet 112 is connected to the first limiting groove 1171, the front lower end cover 215 is inserted into the second limiting groove 1172, the front outlet 114 is connected to the second limiting groove 1172, the front central tube 213 is inserted into the third limiting groove 1173, and the wastewater outlet 116 is connected to the third limiting groove 1173.

[0051] The bottle body 11 is also provided with a central groove 118, the pure water outlet 113 is connected to the central groove 118, and the water outlet central pipe 30 is connected to the central groove 118. For example, the central groove 118 is located at the center of the limiting groove 117, the water outlet central pipe 30 is inserted into the central groove 118 and a second sealing element is provided between the two.

[0052] The reverse osmosis filter element 22 includes a membrane support 221 and a membrane element 222 fixed on the membrane support 221. The membrane element 222 has an inlet side, a pure water side and a wastewater side. The inlet side of the membrane element 222 is connected to the membrane inlet port 115, the wastewater side of the membrane element 222 is connected to the wastewater zone 101, and the pure water side of the membrane element 222 is connected to the inlet side of the post-filter element 23.

[0053] In this embodiment, the outer ring side of the membrane element 222 is the inlet side, the inner circumferential side of the membrane element 222 is the outlet side, and the end of the membrane element 222 near the pre-filter 21 is the wastewater side.

[0054] The reverse osmosis filter element 22 also includes a reverse osmosis lower end cover 223, which supports the membrane element 222. A wastewater outlet groove is formed on the reverse osmosis lower end cover 223, which communicates with the wastewater zone 101, so that the wastewater flowing out from the wastewater side of the membrane element 222 can enter the wastewater zone 101.

[0055] The post-filter element 23 includes a post-filter media 231 and a post-filter center tube 232. The post-filter media 231 is sleeved on the outside of the post-filter center tube 232, and the end of the outlet center tube 30 is inserted into the post-filter center tube 232. The outer ring side of the post-filter element 23 is the inlet side, and the inner ring side is the outlet side. The post-filter center tube 232 is made of filter media that allows fluid to pass through. One end of the post-filter center tube 232 is closed, and the other end is connected to the outlet center tube 30.

[0056] For example, the pre-filter media 212 includes one or more of various filter media such as activated carbon, PP cotton, origami PP, non-woven fabric, ultrafiltration membrane, microfiltration membrane, and scale inhibitor. The post-filter media 231 includes, but is not limited to, at least one of the following filter media: activated carbon, PP cotton, origami PP, ultrafiltration membrane, microfiltration membrane, and mineralizer.

[0057] The bottle cap 12 has a positioning groove 121, and one end of the reverse osmosis filter element 22 is inserted into the positioning groove 121. Specifically, one end of the membrane support 221 is inserted into the positioning groove 121. During installation, the pre-filter element 21 is inserted into the bottle body 11 through the installation port, so that the pre-filter element 21 is inserted into the limiting groove 117. The outlet center tube 30 is inserted into the pre-filter element 21, so that the outlet center tube 30 is inserted into the center groove 118. The post-filter element 23 is inserted into the bottle body 11 through the installation port, so that the post-filter center tube 232 is inserted into the outlet center tube 30. The reverse osmosis filter element 22 is inserted into the bottle body 11 through the installation port, so that the lower end cap 223 of the reverse osmosis filter element is inserted into the pre-filter housing 211. Install the bottle cap 12 onto the bottle body 11 so that the membrane support 221 of the reverse osmosis filter element 22 is inserted into the positioning groove 121. Tighten the bottle cap 12 and the bottle body 11 by rotating the bottle cap 12.

[0058] In this embodiment, the raw water inlet 112, the pure water outlet 113, the pre-filter outlet 114, the membrane inlet 115, and the wastewater outlet 116 are all located at the same end of the bottle body 11, and water flow is achieved through a tubular structure.

[0059] The water to be filtered enters the inlet side of the pre-filter cartridge 21 from the raw water inlet 112, flows along the outer ring of the pre-filter material 212 to the inner ring of the pre-filter material 212, flows out from the pre-filter outlet 114, enters the membrane inlet 115, enters the reverse osmosis cartridge 22 from the inlet side of the reverse osmosis cartridge 22, the pure water flowing out from the pure water side of the reverse osmosis cartridge 22 reaches the inlet side of the post-filter cartridge 23, the wastewater flowing out from the wastewater side of the reverse osmosis cartridge 22 reaches the wastewater zone 101, flows out through the wastewater channel 102 and the wastewater outlet 116, the water entering from the inlet side of the post-filter cartridge 23 flows through the post-filter cartridge 23 to the outlet center pipe 30, and flows out from the pure water outlet 113. Figures 2 to 4 The middle arrow indicates the direction of water flow.

[0060] This embodiment also provides a water purification system, including an inlet component, an outlet component, and the aforementioned filtration device. The inlet component is connected to the raw water inlet 112, and the outlet component is connected to the pure water outlet 113. By integrating the pre-filter 21, reverse osmosis filter 22, and post-filter 23 within the filter bottle 10, the water flows sequentially through the raw water inlet 112, pre-filter 21, reverse osmosis filter 22, post-filter 23, and pure water outlet 113, ensuring a compact structure and reducing space occupation. The reverse osmosis filter 22 is disposed between the pre-filter 21 and the bottle cap 12, and the post-filter 23 is disposed inside the reverse osmosis filter 22, without affecting the flow rate of the pre-filter 21, ensuring sufficient filtration efficiency. The bottle cap 12 is detachably connected to the bottle body 11 to open or close the receiving cavity 111, facilitating installation and disassembly and reducing filter replacement costs.

[0061] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A filtration device, characterized in that, include: A filter bottle (10) includes a bottle body (11) and a bottle cap (12). The bottle body (11) has a receiving cavity (111). The bottle body (11) is provided with a raw water inlet (112) and a pure water outlet (113) communicating with the receiving cavity (111). The bottle cap (12) is detachably connected to the bottle body (11) to open or close the receiving cavity (111). A filter element assembly (20) is disposed in the receiving cavity (111). The filter element assembly (20) includes a pre-filter (21), a reverse osmosis filter (22), and a post-filter (23). The reverse osmosis filter (22) is disposed between the pre-filter (21) and the bottle cap (12). The raw water inlet (112) is connected to the water inlet side of the pre-filter (21). The post-filter (23) is disposed inside the reverse osmosis filter (22). The pure water outlet (113) is connected to the water outlet side of the post-filter (23).

2. The filtration device according to claim 1, characterized in that, The filtration device also includes a water outlet central pipe (30), which is inserted through the pre-filter (21). One end of the water outlet central pipe (30) is connected to the water outlet side of the post-filter (23), and the other end of the water outlet central pipe (30) is connected to the pure water outlet (113).

3. The filtration device according to claim 2, characterized in that, The bottle body (11) is also provided with a wastewater outlet (116). The end of the reverse osmosis filter element (22) away from the bottle cap (12) is inserted into the pre-filter element (21) and a wastewater area (101) is formed between the two. A wastewater channel (102) is formed between the water outlet center pipe (30) and the pre-filter element (21). The wastewater side of the reverse osmosis filter element (22), the wastewater area (101), the wastewater channel (102) and the wastewater outlet (116) are connected in sequence.

4. The filtration device according to claim 2, characterized in that, The post-filter cartridge (23) includes a post-filter material (231) and a post-central tube (232). The post-filter material (231) is sleeved on the outside of the post-central tube (232), and the end of the water outlet central tube (30) is inserted into the post-central tube (232).

5. The filtration device according to claim 2, characterized in that, The pre-filter cartridge (21) includes a pre-filter housing (211), a pre-filter material (212), and a pre-filter center tube (213). The pre-filter material (212) is disposed inside the pre-filter housing (211), the pre-filter center tube (213) passes through the pre-filter material (212), and the water outlet center tube (30) passes through the pre-filter center tube (213).

6. The filtration device according to claim 1, characterized in that, The bottle body (11) is also provided with a pre-outlet (114) and a membrane inlet (115) that are connected to the accommodating cavity (111). The pre-outlet (114) is connected to the outlet side of the pre-filter (21), the membrane inlet (115) is connected to the inlet side of the reverse osmosis filter (22), and the pre-outlet (114) is connected to the membrane inlet (115).

7. The filtration device according to claim 6, characterized in that, The filtration device also includes a pump assembly, which is located outside the filter bottle (10). The inlet of the pump assembly is connected to the pre-outlet (114), and the outlet of the pump assembly is connected to the membrane inlet (115).

8. The filtration device according to claim 1, characterized in that, The bottle body (11) is provided with a limiting groove (117), and one end of the pre-filter (21) is inserted into the limiting groove (117) and a first sealing element (40) is provided between the two. And / or, the bottle cap (12) is provided with a positioning groove (121), and one end of the reverse osmosis filter element (22) is inserted into the positioning groove (121).

9. The filtration device according to any one of claims 1-8, characterized in that, The bottle cap (12) is threadedly connected to the bottle body (11).

10. A water purification system, characterized in that, It includes an inlet water assembly, an outlet water assembly, and a filtration device according to any one of claims 1-9, wherein the inlet water assembly is connected to the raw water inlet (112), and the outlet water assembly is connected to the pure water outlet (113).

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